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Cumulative upkeep
(At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Damage that would reduce your life total to less than 1 reduces it to 1 instead.
The second ability applies only if your life total is being reduced by damage. Other effects or costs (such as “lose 1 life” or “pay 1 life”) can reduce your life total below 1 as normal.